I don't run the PO demo currently, but things to try:
-sometimes a tomcat stop/start is needed
-zmzimletctl listZimlets
-the regex for the demo may have changed; check by unzipping and examining the files - it may look like: /\bGR\w{6}-\w{5}\b/g;

I sent myself an email but the PO numbers aren't highlighted or anything. Just comes thorugh as text.

Heck then we might as well ask you if your in the ajax/advanced client -jk
Or empty your browser cache so you re-grab everything from the server on login.
etc, etc
sry we're just joshing ya-i'm sure your way more competent than that-it's just that we only get the info that people tell us and sometimes the situation doesn't become clear for 5+ posts